Elimination of shrinkage cavity in cast ingots

a technology of shrinkage cavity and cast ingot, which is applied in the field of partial or complete elimination of shrinkage cavity in cast ingot, can solve the problems of insufficient removal of excess metal, defect known as “alligatoring” and other problems, and achieve the effect of avoiding metal spillag
US8347949B2Active Publication Date: 2013-01-08NOVELIS INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
NOVELIS INC
Publication Date
2013-01-08

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Abstract

An exemplary embodiment provides a method of eliminating a shrinkage cavity in a metal ingot cast by direct chill casting. The method involves casting an upright ingot having an upper surface at an intended height. Upon completion of the casting, the lower tip of the spout is maintained below the molten metal near the center of the upper surface. The metal flow through the spout is terminated and a partial shrinkage cavity is allowed to form as metal of the ingot shrinks and contracts. Before the partial cavity exposes the lower tip of the spout, the cavity is preferably over-filled with molten metal, while avoiding spillage of molten metal, and then the flow of metal through the spout is terminated. These steps are repeated until no further contraction of the metal causes any part of the upper surface to contract below the intended ingot height.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the priority right of prior co-pending U.S. provisional Patent Application Ser. No. 61 / 460,029 filed on Dec. 22, 2010 by applicants named herein. The entire contents of Application Ser. No. 61 / 460,029 are specifically incorporated herein by this reference.BACKGROUND OF THE INVENTION

[0002] (1) Field of the Invention

[0003] This invention relates to the partial or complete elimination of shrinkage cavities in cast ingots. More particularly, the invention relates to the partial or complete elimination of such cavities that form during direct chill (DC) casting of metal ingots, especially (although not exclusively) ingots made of aluminum and aluminum-based alloys.

[0004] (2) Description of the Related Art

[0005] Metal ingots, especially those made of aluminum and aluminum-based alloys, may be formed by direct chill (DC) casting techniques in which molten metal is fed into the upper end of a chilled annular (usually rectangul...

Claims

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